How to do system identification on a system involving internal delays?

I have a negative feedback loop involving a gain, an integrator and a time delay. It acts as a controller. I do have some data and want to determine the gain and time delay from the data. As far as I can see, I cannot use idgrey and greyest since idgrey requires me to give A,B,C,D matrices directly and does not support InternalDelay . Is there a way to identify such a system involving internal delay?

Answer 1

[Sainath Varikuti]

Hello Joerg,

For linear system identification you may use 'procest' function to estimate the process model for a given data. Following is the documentation on 'procest' function

http://www.mathworks.com/help/ident/ref/procest.html

Alternatively, you may also use the Simulink Design Optimization toolbox to estimate the system for a given data. http://www.mathworks.com/help/sldo/examples/estimate-model-parameter-values-gui.html

Regards,

Sainath.